15th International Congress of Phonetic Sciences (ICPhS-15)

Barcelona, Spain
August 3-9, 2003

The Stability of Locus Equation Encoding of Stop Place

Harvey M. Sussman, Golnaz Modarresi

University of Texas at Austin, USA

This study explored the consistency of locus equation (LE) slopes as phonetic descriptors of stop place in VCV utterances. A range of naturally occurring phonetic parameters were systematically varied to alter the dynamics of temporal and spatial overlap of articulatory movements.
   These parameters included: syllable form (open/closed/geminate), variable V1 contexts, and aspiration. Results showed that singleton and geminate open syllables yielded identical slopes, while closed syllables yielded decreased, but contrastive slopes, irrespective of voicing. V1 contexts had minimal effects on LE slopes. Voiceless /p/ and /t/ had lower slopes than voiced cognates, but velars did not show voicing differences. Methodological differences in measuring F2 onsets accounted for lowering of slopes in aspirated stops.

Full Paper

Bibliographic reference.  Sussman, Harvey M. / Modarresi, Golnaz (2003): "The stability of locus equation encoding of stop place", In ICPhS-15, 1931-1934.